Prolonging Indoor Bloom
To prolong bloom time indoors, be sure to pinch off the yellow anthers as soon as the flowers open. This prevents pollination (un-pollinated flowers last longer), and keeps the flowers white. Daytime temperatures in the 70’s and nighttime temperatures in the 40’s will also prolong bloom time. Warmer temperatures negatively impact bloom time.
Preparing for Outdoor Bloom
If grown indoors as a houseplant, it’s difficult to get an Easter lily to re-bloom, but if planted outdoors, they readily re-bloom each year. To prepare for planting outdoors (once your Easter lilies flowers have faded) remove all of the plant’s flowers. This forces the plant to enlarge the bulb rather than producing flower seed. Then, keep it in bright, indirect light until nighttime temperatures stay above 40 degrees outdoors.
Plant it about 6 inches deep, in a partially-sunny site with well-drained soil. Cover with several inches of mulch in cold winter areas for winter protection. Easter lilies planted this way should bloom mid-summer next year.
Right after Easter is also a good time to check for deals on Easter lilies at stores, they’re usually trying to get rid of them (who wants them after Easter has passed after all). Sometimes you can find them for ridiculously low prices!